Overhead cost not coming in production order

Hello Friends,

I have assigned overhead group to material master in costing 1 view.Overhead group is assigned to Overhead key and valuation area of mine (plant).Even i have defined overhead rates i.e, percentage overhead for my company code.Then i calculated the overhead using KGI2.It shows no error in log and shows 1 overhead calculated.But when i go inside the production order, it doesn't show the overhead cost in actual cost, why?